Multiplex Magister Notice De Construction page 27

that a simple 4-channel radio control system can be used to
control the model. An articulated pushrod connector is mounted
on the servo output disc to provide an easy means of engaging
and disengaging the second linkage. The pushrod in the right-
hand wing is fixed permanently to the swivelling part of the
connector. The wire pushrod for the left-hand aileron is
connected to the servo output disc using a simple Z-bend. The
servo lead runs to the fuselage through the tunnel in front of
the wing joiner tube. The unsupported length of the pre-formed
pushrod presents no problems.
Mount the articulated connector housing 37 in the outermost
hole of the servo output disc using the M1.6 x 4 mm countersunk
screw 39 - see Fig. 43. Tighten the screw carefully: just to the
point where the articulated housing swivels smoothly, but does
not wobble. It is important that the housing should be free-
moving, but not sloppy. You may need to tighten the screw
slightly after the first few flights. Fit the socket-head grubscrew
28 in the articulated connector barrel 38, and snap the barrel
38 into the housing.
Figs. 40 + 43
Note: it is very easy to disconnect the pushrod connector using
a screwdriver with a blade tip approx. 4 mm wide. Simply slip
the screwdriver between the articulated connector housing and
the barrel and twist it gently - the barrel pops out, and can later
be re-fitted in exactly the same position.
Checking the wing joiner system
Plug the wing panels together using the joiner tube 45. Trim
the parts if necessary to obtain a close fit.
Fig. 41
Installing the aileron servo and snakes
The left-hand aileron linkage consists of the snake outer sleeve
52, the snake inner tube 57 and the pre-formed steel rod 47.
Fit these parts together and connect the pre-formed end to the
servo output disc adjacent to the articulated pushrod connector.
Caution: the pre-formed pushrod must be fitted between the
servo and the output disc, or it will foul the articulated connector.
Glue the aileron servo in the servo recess as described for the
rudder and elevator servos.
The right-hand aileron linkage consists of the snake outer sleeve
53, the snake inner tube 58 and the steel rod 48.
Figs. 42 + 43
Carefully curve the snake outer sleeves to follow the line of the
channels in the wings, fit them in the channels running to the
ailerons and secure them with cyano. The outer sleeve should
end short of the aileron, approximately at the end of the inte-
gral pushrod fairing, and should not be glued in place over the
last 4 cm.
The prepared aileron horns 24 - with the row of holes facing
the hinge line - can now be glued in the horn recesses in the
ailerons, after applying activator as previously described. Fit
the other ends of the steel pushrods 47 / 48 through the cross-
holes in the pushrod connectors 25. Set the servo and ailerons
to neutral (centre), adjust the pushrod lengths at the pushrod
connectors and tighten the clamping screws. Caution: check
that the two wings make full contact at the root before you tighten
the screws.
Figs. 44
Check that the joined wings can be attached to the fuselage
correctly using the screws 31 and the wing retainer straps 30.
Trim carefully if necessary. You can use the combination tool
79 supplied to tighten the screws.
Fig. 45
Trimming the cowl / canopy to fit
GP:
The glow version cowl / canopy 9 has to be cut away and
trimmed to clear the motor and carburettor. At the same time
mark the position of the needle valve and cut a clearance hole
for it. This is one area where a compromise has to be struck
between open access and smooth good looks. We recommend
that you err on the side of good access, and allow plenty of
clearance. A soldering iron is a useful tool for cutting narrow
slots.
Attaching the cowl / canopy
The electric cowl / canopy 8 is fitted by sliding it into the fuselage
from the front, towards the wing; it can then be folded down
into position at the front.
Fig. 46
Installing the canopy latches
Glue the canopy latches 22 to both sides of the front fuselage
area.
Fig. 47
Connect the latch straps 75 to the canopy latches 22 on both
sides and position the appropriate cowl / canopy (8 or 9) on the
fuselage. Fix the two latch straps 75 to the cowl / canopy using
one screw 23 each, holding them under slight tension. Check
that the latches operate reliably, then apply a little cyano to the
area of the screw head to provide extra strength where the
latch straps are screwed. To improve the appearance of the
latches the screw-heads can be coloured black using a black
waterproof felt-tip pen.
Fig. 48
Soldering the speed controller to the motor
The speed controller # 7 5024 can now be soldered to the motor
terminals. Take care to maintain correct polarity: the single-
stage gearbox reverses the direction of rotation, so the positi-
ve wire must be soldered to the negative motor terminal.
Complete the soldering as quickly as possible to avoid heat
damage, applying solder whilst the iron is in contact.
The motor is supplied with a suppressor already fitted - when
soldering the speed controller leads to the terminals make sure
that the wire ends of the capacitor are soldered in place at the
same time.
Fitting the propeller and spinner
The propeller and spinner are included in the Electric Power
Set 680G # 33 2668. Mount these parts on the motor as
described in the instructions supplied in the set.
GP:
Installing the receiver battery and switch harness
If you are building the glow version, you have to install a sepa-
rate receiver power supply consisting of a receiver battery and
a switch harness. Fix the battery in the fuselage using Velcro
tape. Check the CG position before you position the battery
permanently.
The switch can be installed inside the fuselage or on the outside,
in which case you will need to cut a suitable hole for it.
Installing the flight battery and receiver
The flight pack and receiver are installed as follows: the flight
battery should be positioned in the fuselage under the wing,
with the receiver below it. Check the CG position before you
position these items permanently. Glue the Velcro tape
("mushroom" face) to the inside of the fuselage floor at the
flight battery / receiver location. Note that the adhesive of the
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